why am I so tired all the time?!

lately I am so exhausted. i get plenty of sleep and rest trust me and I don't do any strenuous activities other than going to school and cleaning and stuff. the basic younger adult stuff. but lately I am so exhausted all the time. 
I can barely keep my eyes open honestly. My period is due next week. I'm definitely not pregnant btw. 
Any ideas??? 
Thanks y'all 

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